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I'm using node.js server and GCloud. What is exactly the GCloud's pub/sub? Does it work like socket or tcp? My server is using socket.io and node-ipc for communicating, can GCloud's pub/sub be the alternative?
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Key Differences The core difference between Pub/Sub and Cloud Tasks is in the notion of implicit vs. explicit invocation. Pub/Sub aims to decouple publishers of events and subscribers to those events.
Google Cloud Pub/Sub provides messaging between applications. Cloud Pub/Sub is designed to provide reliable, many-to-many, asynchronous messaging between applications. Publisher applications can send messages to a "topic" and other applications can subscribe to that topic to receive the messages.
Pub/Sub is used for streaming analytics and data integration pipelines to ingest and distribute data.
In general, both are very solid Stream processing systems. The point which make the huge difference is that Pubsub is a cloud service attached to GCP whereas Apache Kafka can be used in both Cloud and On-prem.
PubSub is a messaging service. These allow asynchronous communication between two applications; one "publishes a message" to a message service and then some other process reads that message from the message service at a later time - seconds, minutes, or hours later. The application that published the message does not need to "stay connected".
That's really useful for scalable and reliable communication between applications - but quite different from socket-based communication which is point-to-point between a client and server process. Implementing request/response type communications is difficult over a messaging service - "send and forget" is the usual model. As @komarkovich noted, a message can also be received by many applications if that is appropriate.
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